Typical ORP Swing

hilde123

New member
Those monitoring ORP, how much does the level swing during the day. Mine swings about 40 and it appears to be the inverse of the PH, whereas when the PH increases during the day, the ORP drops. Not sure if there is a chemical relationship or it is merely an increase in demand for oxygen by respiration of corals and fish during the daylight hours.
 
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